bug(realpath): when a filename larger it do not error out

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#13,154 opened on Jun 28, 2026 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 55/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Quiet
Tech stack: rust
Domain: cli

Research direction

Start at the realpath command entry point and reproduce the 256-character filename case shown in the issue, comparing its result with gnurealpath. Trace how the utility handles an overlong filename and add a regression test; done means realpath reports the filename-too-long error instead of printing a path.

Written by the indexing model from the issue text.

Description

U - realpath

Hi, uutils mainteners

we confirmed the realpath utility not error out when the filename is longer than the filename maxium, as i confirmed

relunsec@relunsec:~/software/coreutils/target/debug$ ./realpath $(python3 -c 'print("A"*256)')
/home/relunsec/software/coreutils/target/debug/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
relunsec@relunsec:~/software/coreutils/target/debug$ gnurealpath $(python3 -c 'print("A"*256)')
gnurealpath: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: File name too long
relunsec@relunsec:~/software/coreutils/target/debug$

Dominant language: Rust
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